HVAC Blower Impeller Chevron Blade Angular Offset
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Solution Overview
Problem
HVAC systems often produce airflow with non-homogeneous velocity contours, leading to inefficient air distribution and performance issues.
Innovation Solution
The use of impellers with chevron blade patterns and unrestrictive interior spaces, such as those in the described air handling unit, which improves airflow velocity contours by maintaining angular offset directionality between blade sections and minimizing obstructions within the impeller interior.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional impeller designs are used, then the structure is simple and easy to manufacture, but the air output velocity contour is non-homogeneous with pockets of low and high velocity
Solution Approach 1:
The impeller is divided into multiple blade sections (first blade section, second blade section, third blade section) with different configurations. Each blade section has specific angular offsets and geometric characteristics that work together to homogenize the velocity contour. This segmentation allows different parts of the impeller to perform specialized functions in optimizing airflow distribution.
Solution Approach 2:
The blade sections are configured with asymmetric angular offsets relative to each other. The first blade section has a specific angular position, the second blade section is offset by a first angular offset, and the third blade section is offset by a second angular offset. This asymmetric arrangement breaks the symmetry that causes velocity pockets and creates more uniform airflow distribution.
2Manufacturing precision
If restrictive impeller interiors are used, then the structure provides structural support, but the airflow velocity contour becomes non-homogeneous
Solution Approach 1:
The impeller design applies local quality by creating an unrestrictive interior space in specific regions where airflow needs to be optimized, while maintaining structural integrity through the blade sections themselves. The interior space is strategically designed to be minimal or non-existent in areas where it would interfere with airflow homogeneity, while the blade structure provides necessary support.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration results in a more homogeneous and efficient air output velocity contour, enhancing the performance and efficiency of HVAC systems by reducing pockets of low and high velocity, thereby improving air distribution and system performance.
Implementation Method 1
HVAC systems sometimes comprise blowers that output air with non-homogeneous velocity contours
Implementation Method 2
improves airflow velocity contours by maintaining angular offset directionality between blade sections and minimizing obstructions within the impeller interior
Data Source
AI summary
An impeller has an impeller axis, a first blade support, a second blade support, a third blade support, a plurality of first blades extending between the first blade support and the second blade support, and a plurality of second blades extending between the second blade support and the third blade support. An angular location of attachment of the first blades to the first blade support is angularly offset from an angular location of attachment of the first blades to the second blade support in a first angular direction, wherein an angular location of attachment of the second blades to the third blade support is angularly offset from an angular location of attachment of the second blades to the second blade support in the first angular direction, and wherein the second blade support is configured to allow airflow longitudinally through the interior of the impeller.